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| The coating at the back of the eye composed of rods and cones. This layer of cells converts photons (or packets of light) into electrical impulses that travel through the optic nerve to the brain. |
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| A protective layer that covers the front of the eye. |
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| A gel like substance that fills the inner layer of the eye and maintains the shape of the eye. |
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| A watery substance that maintains the shape of the front part of the eye. |
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| Also know as the "blind spot" this is the portion of the retina where the optic nerve enters the eye. There are no rods or cones located on this part of the eye. |
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| A strand of nervous tissue that extends from the back of the eye to the brain. |
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| A layer of tissue that carries blood to the rods and cones in the eye. This blood contains oxygen and nutrients needed by these cells to live. |
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| One of the two types of cells found in the retina that detect light. These cells allow us to distinguish between light and dark. |
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| One of the two types of cells found in the retina that detect light. These cells help us see color. |
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| The structure inside that focuses an image on the back of the retina. By changing the shape of this structure, the eye can focus on objects close to or further away from a person. |
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| These muscles expand and contract to change the shape of the lens allowing the eye to focus at different distances. |
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| A region on the retina containing extra rods and cones that allow for more acute vision directly in front of the eye. |
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| This muscle at the front of the eye that controls the amount of light entering the eye. |
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